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Chemistry

Chemistry
The percentage of Nitrogen in Air is

85.02
0.03
78.03
0.94

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Chemistry
Catalyst is a substance which

Has no action on the rate of the reaction
Decreases the rate of reaction
None of these
Increases the rate of the reaction

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Chemistry
Which of the following metals occurs in free state ?

Lead
Iron
Zinc
Copper

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Oxygen and Silicon
Oxygen and Iron
Silicon and Iron
Silicon and Aluminium

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Chemistry
Which one of the following was used as a chemical weapon in the first world war ?

Water gas
Hydrogen cyanide
Mustard gas
Carbon monoxide

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Chemistry
When formaldehyde and potassium hydroxide are heated, we get

Methane
Ethyl formate
Acetylene
Methyl alcohol

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